Pre-straightening connector for horizontal steel bars of box girder

Abstract

The utility model provides a box girder horizontal reinforcing steel bar pre-straightening connector, which relates to the technical field of box girder horizontal reinforcing steel bar processing, and comprises a steel circular pipe serving as a main body structure, notches are arranged at two ends of the circular pipe, the notches penetrate through the circular pipe, fixed pipes are welded at the positions of the notches, two vertical pipes are arranged in the circular pipe, and the vertical pipes are connected with the circular pipe. The two vertical pipes are connected with the corresponding notches in an inserted mode. According to the box girder horizontal steel bar pre-straightening connector, a horizontal steel bar is inserted into the round pipe, the vertical pipe rotates to drive the lifting plate to be close to each other under driving of the two-way threaded groove, then clamping of the horizontal steel bar is completed, meanwhile, a reusable steel bar is inserted into the other end, and the vertical pipe is rotated to drive the lifting plate to move to complete clamping and fixing of the steel bar; after the steel reinforcement framework is bound, the vertical pipe is rotated, the horizontal steel reinforcement can be pulled out, the steel reinforcement which can be repeatedly used is taken down and waits for being used again next time, and unnecessary steel waste is avoided.

Description

Technical Field

[0001] The utility model relates to a pre-straightening connector, in particular to a box girder horizontal steel bar pre-straightening connector, belonging to the technical field of box girder horizontal steel bar processing. Background Art

[0002] A box girder is a type of beam used in bridge engineering. It is hollow inside and has flanges on both sides of the upper part, similar to a box, hence its name. Box girders are usually made of steel and concrete. They are characterized by superior dynamic performance, high torsional stiffness, good integrity, and strong applicability. They can be used in both straight and curved sections. Box girders in reinforced concrete structures are divided into prefabricated box girders and cast-in-place box girders. Box girders prefabricated in an independent site can be erected after the foundation engineering is completed, combined with a bridge-erecting machine, which can speed up the progress of the project and save construction time.

[0003] At present, the horizontal steel bar pre-straightening technology is generally used in the prefabricated box girder frame binding. The qualified rate of the steel bar protective layer is improved by improving the straightness of the horizontal steel bars. During operation, the horizontal steel bars are cut 1.6m long and each bar is used to pass through the pre-straightening mold hole to complete the tensioning and pre-straightening. After the bottom web steel bar frame is tied, the 0.8m long steel bars at both ends of the horizontal bars are cut off, and the steel bar frame is lifted and installed.

[0004] However, although the above method can improve the straightness of the horizontal steel bars by stretching, thereby improving the qualified rate of the steel bar protective layer, the stretching of the horizontal steel bars requires the machine to directly act on the horizontal steel bars themselves, resulting in the need to reserve a certain length of horizontal steel bars for connection with the machine when cutting the steel bars. After the pre-straightening is completed, the reserved steel bars cannot be used for the casting of the box girder because they do not participate in the binding of the steel bar skeleton. Therefore, the reserved steel bars need to be cut off, and the cut steel bars have basically no value for reuse. Each pre-straightening requires cutting the reserved steel bars, resulting in serious waste of steel bars. Utility Model Content

[0005] The utility model provides a box girder horizontal steel bar pre-straightening connector, which can assist the horizontal steel bars in completing pre-straightening and also avoids unnecessary waste of steel materials.

[0006] The utility model is realized through the following technical solutions: A pre-straightening connector for horizontal steel bars of a box girder, which includes a steel circular pipe as the main structure. Both ends of the circular pipe are provided with notch openings that penetrate the circular pipe. Fixed pipes are welded at the notch positions. Two vertical pipes are arranged inside the circular pipe, and both of the vertical pipes are inserted into the corresponding notch openings. A bidirectional thread groove is provided on the outer surface of the vertical pipe. Two groups of lifting plates are arranged inside the circular pipe, and each lifting plate is threadedly connected to its corresponding vertical pipe through the bidirectional thread groove. A plurality of adjusting rods arranged in a circular pattern are fixed at both ends of the vertical pipe. Two auxiliary devices for assisting in aligning the steel bars and two clamping devices for clamping the steel bars are arranged inside the circular pipe.

[0007] The auxiliary device includes a plurality of arc-shaped plates arranged in a circular pattern. Both ends of the arc-shaped plate are bent outward. By arranging a plurality of arc-shaped plates in a circular pattern, a shape similar to a flared opening can be formed, which is convenient for the insertion of horizontal steel bars.

[0008] The auxiliary device further includes an auxiliary telescopic rod. One end of the auxiliary telescopic rod is fixed to a fixed plate, and the other end of the auxiliary telescopic rod is fixed to the circular pipe. An auxiliary spring is sleeved on the outer surface of the auxiliary telescopic rod. One end of the auxiliary spring is fixed to the arc-shaped plate, and the other end of the auxiliary spring is fixed to the circular pipe. Through the installation of the auxiliary telescopic rod and the auxiliary spring, the arc-shaped plate can align the horizontal steel bar with the center of the circular pipe when facing horizontal steel bars of different sizes inserted.

[0009] The clamping device includes a rotating ring arranged inside the circular pipe. The rotating ring is rotatably connected to the circular pipe. A first connecting block is fixed to the inner wall of the rotating ring. A clamping telescopic rod is fixed to the inner wall of the circular pipe. The other end of the clamping telescopic rod is fixed to a moving groove. A clamping wheel is installed on the inner wall of the moving groove. A second connecting block is fixed to the side of the moving groove. A rotating plate is hinged to the side of the second connecting block. The other end of the rotating plate is hinged to the first connecting block. By rotating one rotating plate, the rotating ring can be driven to rotate, and then the other rotating plates can be driven to rotate.

[0010] A connecting plate is fixed to the side of the lowermost second connecting block. The other end of the connecting plate is fixed to the lowermost arc-shaped plate. When the horizontal steel bar is inserted, the arc-shaped plate is driven to move, and the connecting plate is driven to move. The movement of the connecting plate drives the second connecting block to descend, and then drives the rotating plate to rotate.

[0011] A fixed rod is arranged inside the circular pipe. Both ends of the fixed rod are fixed to the circular pipe. The fixed rod penetrates through the two lifting plates. The fixed rod can assist the lifting plates to lift and lower stably when the vertical pipe rotates.

[0012] The inner side surface of the clamping wheel and the inner side surface of the arc-shaped plate are at the same height, and the two auxiliary devices and the two clamping devices are symmetrically arranged.

[0013] The utility model provides a pre-straightening connector for horizontal steel bars of box girders, and the beneficial effects thereof are as follows:

[0014] 1. For the pre-straightening connector for horizontal steel bars of box girders, the horizontal steel bar is inserted into the circular tube. By rotating the vertical tube, the lifting plate can be driven to approach each other under the drive of the bidirectional thread groove, so as to complete the clamping of the horizontal steel bar. At the same time, the other end inserts a reusable steel bar, and the lifting plate is driven to move by rotating the vertical tube to complete the clamping and fixing of it. Then the pre-straightening work of the horizontal steel bar starts. After the steel bar skeleton is tied up, rotate the vertical tube, and the horizontal steel bar can be drawn out. The reusable steel bar is taken off and waits to be used again next time, avoiding unnecessary waste of steel.

[0015] 2. For the pre-straightening connector for horizontal steel bars of box girders, by setting the auxiliary device and the clamping device, when the auxiliary device faces the insertion of horizontal steel bars of different sizes, it can align them with the center of the circular tube to avoid deviation when inserting the horizontal steel bar. The clamping device can clamp steel bars of different sizes and cooperate with the arc-shaped plate to realize the two-point clamping and fixing of the horizontal steel bar, avoiding the shaking of the horizontal steel bar during the pre-straightening operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a three-dimensional structural schematic diagram of the utility model;

[0017] Figure 2 is an internal structural schematic diagram of the circular tube of the utility model;

[0018] Figure 3 is a structural schematic diagram of the auxiliary device of the utility model;

[0019] Figure 4 is a structural schematic diagram of the clamping device of the utility model;

[0020] Figure 5 is a side view of the connecting plate of the utility model.

[0021] DESCRIPTION OF THE REFERENCE NUMERALS

[0022] 1. Circular tube; 2. Fixed tube; 3. Vertical tube; 4. Lifting plate; 5. Adjusting rod; 6. Auxiliary device; 7. Clamping device;

[0023] 601. Arc-shaped plate; 602. Auxiliary telescopic rod; 603. Auxiliary spring;

[0024] 701. Rotating ring; 702. First connecting block; 703. Clamping telescopic rod; 704. Moving groove; 705. Clamping wheel; 706. Second connecting block; 707. Rotating plate; 708. Connecting plate;

[0025] 8. Fixed rod. Specific embodiments

[0026] Please refer to Figures 1 to 5 , an embodiment of the present utility model provides a pre - straightening connector for horizontal steel bars of a box girder, which includes a steel round tube 1 as the main structure. Both ends of the round tube 1 are provided with notches, and the notches penetrate the round tube 1. A fixed tube 2 is welded at the notch position. Two vertical tubes 3 are arranged inside the round tube 1, and both vertical tubes 3 are inserted into the corresponding notches. A bidirectional thread groove is provided on the outer surface of the vertical tube 3. Two groups of lifting plates 4 are arranged inside the round tube 1, and each lifting plate 4 is thread - connected with its corresponding vertical tube 3 through the bidirectional thread groove. A plurality of adjusting rods 5 arranged in a circumferential manner are fixed at both ends of the vertical tube 3. Two auxiliary devices 6 for assisting in aligning steel bars and two clamping devices 7 for assisting in clamping steel bars are arranged inside the round tube 1.

[0027] Please refer specifically to Figure 1 , Figure 2 and Figure 3 , the auxiliary device 6 includes a plurality of arc - shaped plates 601 arranged in a circumferential manner. Both ends of the arc - shaped plate 601 bend outward. By arranging a plurality of arc - shaped plates 601 in a circumferential arrangement, a shape similar to a flared opening can be formed, which is convenient for the insertion of horizontal steel bars. The auxiliary device 6 also includes an auxiliary telescopic rod 602. One end of the auxiliary telescopic rod 602 is fixed to the fixed plate, and the other end of the auxiliary telescopic rod 602 is fixed to the round tube 1. An auxiliary spring 603 is sleeved on the outer surface of the auxiliary telescopic rod 602. One end of the auxiliary spring 603 is fixed to the arc - shaped plate 601, and the other end of the auxiliary spring 603 is fixed to the round tube 1. Through the installation of the auxiliary telescopic rod 602 and the auxiliary spring 603, the arc - shaped plate 601 can align the horizontal steel bar with the center of the round tube 1 when facing horizontal steel bars of different sizes inserted.

[0028] Please refer specifically to Figure 2 , Figure 4 and Figure 5, the clamping device 7 includes a rotating ring 701 arranged inside the circular tube 1. The rotating ring 701 is rotatably connected to the circular tube 1. A first connecting block 702 is fixed to the inner wall of the rotating ring 701. A clamping telescopic rod 703 is fixed to the inner wall of the circular tube 1. The other end of the clamping telescopic rod 703 is fixed with a moving groove 704. A clamping wheel 705 is installed on the inner wall of the moving groove 704. A second connecting block 706 is fixed to the side of the moving groove 704. A rotating plate 707 is hinged to the side of the second connecting block 706. The other end of the rotating plate 707 is hinged to the first connecting block 702. The rotation of one rotating plate 707 can drive the rotation of the rotating ring 701, and then drive the rotation of the remaining rotating plates 707. A connecting plate 708 is fixed to the side of the lowermost second connecting block 706. The other end of the connecting plate 708 is fixed to the lowermost arc-shaped plate 601. When the horizontal steel bar is inserted, it drives the movement of the arc-shaped plate 601, which drives the movement of the connecting plate 708. The movement of the connecting plate 708 drives the descent of the second connecting block 706, and then drives the rotation of the rotating plate 707.

[0029] Please refer specifically to Figure 2 , Figure 3 and Figure 5 , a fixing rod 8 is arranged inside the circular tube 1. Both ends of the fixing rod 8 are fixed to the circular tube 1. The fixing rod 8 penetrates through the two lifting plates 4. The fixing rod 8 can assist the lifting plates 4 to lift and lower stably when the vertical tube 3 rotates. The inner side of the clamping wheel 705 and the inner side of the arc-shaped plate 601 are at the same height. The two auxiliary devices 6 and the two clamping devices 7 are symmetrically arranged.

[0030] Working principle: When in use, first insert the horizontal steel bar into the circular tube 1. The horizontal steel bar collides with the arc-shaped plate 601. The arc-shaped plate 601 moves and is reset with the assistance of the auxiliary telescopic rod 602 and the auxiliary spring 603, facilitating the insertion of the horizontal steel bar. The movement of the arc-shaped plate 601 drives the movement of the connecting plate 708. The movement of the connecting plate 708 drives the descent of the second connecting block 706, and then drives the rotation of the rotating plate 707. The rotation of the rotating plate 707 drives the rotation of the rotating ring 701. The rotation of the rotating ring 701 drives the movement of the remaining moving grooves 704, realizing the clamping of the horizontal steel bar by the clamping wheels 705. At the same time, in cooperation with the arc-shaped plate 601, it realizes the two-point clamping and fixing of the horizontal steel bar, preventing the horizontal steel bar from shaking during the pre-straightening operation.

[0031] The rotation of the vertical tube 3 can drive the lifting plates 4 to approach each other under the drive of the double-threaded groove, thereby completing the clamping of the horizontal steel bar. At the same time, insert the reusable steel bar at the other end, and drive the lifting plates 4 to move through the rotation of the vertical tube 3 to complete the clamping and fixing of it. Start the pre-straightening work of the horizontal steel bar. After the steel bar skeleton is tied, rotate the vertical tube 3, and the horizontal steel bar can be withdrawn. The reusable steel bar is removed and waiting to be used again next time, avoiding unnecessary steel waste.

[0032] The foregoing has shown and described the basic principles, main features and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above-mentioned embodiments, and what is described in the above-mentioned embodiments and the specification is only to illustrate the principle of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will also have various changes and improvements, and these changes and improvements fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. A box girder horizontal steel bar pre-straightening connector, comprising a steel round tube (1) as a main structure, characterized in that: Both ends of the circular tube (1) are provided with slots, the slots penetrate the circular tube (1), and fixed tubes (2) are welded at the slots. Two vertical tubes (3) are arranged inside the circular tube (1), and the two vertical tubes (3) are plugged into the corresponding slots. The outer surfaces of the vertical tubes (3) are provided with bidirectional thread grooves. Two groups of lifting plates (4) are arranged inside the circular tube (1), and each lifting plate (4) is threadedly connected to its corresponding vertical tube (3) through a bidirectional thread groove. A plurality of circumferentially arranged adjusting rods (5) are fixed at both ends of the vertical tube (3). Two auxiliary devices (6) for auxiliary steel bar alignment and two clamping devices (7) for auxiliary steel bar clamping are arranged inside the circular tube (1).

2. A box beam horizontal steel bar pre-straightening connector according to claim 1, characterized in that: The auxiliary device (6) comprises a plurality of arc-shaped plates (601) arranged in a circle, and two ends of the arc-shaped plates (601) are bent outwards.

3. The box beam horizontal steel bar pre-straightening connector according to claim 1, characterized in that: The auxiliary device (6) further comprises an auxiliary telescopic rod (602), one end of the auxiliary telescopic rod (602) being fixed to the fixed plate, the other end of the auxiliary telescopic rod (602) being fixed to the circular tube (1), an auxiliary spring (603) being sleeved on the outer surface of the auxiliary telescopic rod (602), one end of the auxiliary spring (603) being fixed to the arc-shaped plate (601), and the other end of the auxiliary spring (603) being fixed to the circular tube (1).

4. The box beam horizontal steel bar pre-straightening connector according to claim 1, characterized in that: The clamping device (7) comprises a rotating ring (701) arranged inside the circular tube (1), the rotating ring (701) being rotatably connected to the circular tube (1), a first connecting block (702) being fixed to the inner wall of the rotating ring (701), a clamping telescopic rod (703) being fixed to the inner wall of the circular tube (1), a moving groove (704) being fixed to the other end of the clamping telescopic rod (703), a clamping wheel (705) being installed on the inner wall of the moving groove (704), a second connecting block (706) being fixed to the side of the moving groove (704), a rotating plate (707) being hinged to the side of the second connecting block (706), and the other end of the rotating plate (707) being hinged to the first connecting block (702).

5. A box beam horizontal reinforcement pre-straightening connector according to claim 4, characterized in that: A connecting plate (708) is fixed to the side surface of the second connecting block (706) located at the bottom, and the other end of the connecting plate (708) is fixed to the arc-shaped plate (601) located at the bottom.

6. The box girder horizontal steel bar pre-straightening connector according to claim 1, characterized in that: A fixing rod (8) is arranged inside the circular tube (1), both ends of the fixing rod (8) are fixed to the circular tube (1), and the fixing rod (8) passes through the two lifting plates (4).

7. The box beam horizontal reinforcement pre-straightening connector according to claim 4, characterized in that: The inner side surface of the clamping wheel (705) is located at the same height as the inner side surface of the arc-shaped plate (601), and the two auxiliary devices (6) and the two clamping devices (7) are symmetrically arranged.

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